Extend variable pattern matching to support both `#` and `@` markers,
with `@` specifically used for agent context variables. Update regex
patterns, text processing logic, and add sub-graph persistence for agent
variable handling.
- Updated `checkMakeGroupAvailability` to include a check for existing group nodes, preventing group creation if a group node is already selected.
- Modified `useMakeGroupAvailability` and `useNodesInteractions` hooks to incorporate the new group node check, ensuring accurate group creation logic.
- Adjusted UI rendering logic in the workflow panel to conditionally display elements based on node type, specifically for group nodes.
- Enhanced `useNodesInteractions` to better manage group node handlers and connections, ensuring accurate identification of leaf nodes and their branches.
- Updated logic to create handlers based on node connections, differentiating between internal and external connections.
- Refined initial node setup to include target branches for group nodes, improving the overall interaction model for grouped elements.
- Introduced GroupDefault node with metadata and default values for group nodes.
- Enhanced useNodeMetaData hook to handle group node author and description using translations.
- Added translations for group node functionality in English, Japanese, Simplified Chinese, and Traditional Chinese.
- Introduced `createGroupInboundEdges` function to manage edges for group nodes, ensuring proper connections to head nodes.
- Updated edge creation logic to handle group nodes in both inbound and outbound scenarios, including temporary edges.
- Enhanced validation in `useWorkflow` to check connections for group nodes based on their head nodes.
- Refined edge processing in `preprocessNodesAndEdges` to ensure correct handling of source handles for group edges.
- Added support for UI-only group nodes, including custom-group, custom-group-input, and custom-group-exit-port types.
- Enhanced edge interactions to manage temporary edges connected to groups, ensuring corresponding real edges are deleted when temp edges are removed.
- Updated node interaction hooks to restore hidden edges and remove temp edges efficiently.
- Implemented logic for creating and managing group structures, including entry and exit ports, while maintaining execution graph integrity.
